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Patented Sept. 27, I898. C. H. B. BANDLEFF.

HEATING DRUM FOR LAMPS.

(Application filed June 5, 1897.) (No Model.)

1m: mums PETERS co., PHoTc-Lrmu, WASHW'JTOMP. c

NITED STATES PATENT OFFICE.

CARL H. B. RANDLEFF, OF ST. PAUL, MINNESOTA, ASSIGNOR TO ROBE. C.

WHITE, TRUSTEE, OF SAME PLACE.

HEATING-DRUM FOR LAMPS.

SPECIFICATION forming part of Letters Patent No. 61 1,509, dated September 27', 1898.

I Application filed June 5, 1897.j Serial No. 639,630. (No model.)

To a whom it may concern.-

Be it known that I, CARL H. B. RANDLEFF, of St. Paul, Ramsey county, Minnesota, have invented certain Improvements in Heating- Drums for Lamps, of which the following is a.

broken away to show the interior construc-- tion; and Fig. 2 is a horizontal cross-section of the drum, taken through the lower portion thereof.

In the drawings let A represent a cylindrical drum, 2 its side walls, and 3, 4, and 5 the heads. The head 3 is of annular form and double, having its inner or upper wall 6 arched and slitted or otherwise perforated to allow the passage of air therethrough and serving to distribute it around the interior of a the drum. The outer or lower wall is formed with necks or collars 7, downwardly projecting to receive the tubular standards or legs B, which are formed of telescoping sections 8 and 9. The head 3 is perforated in line with the collars, so as to admit the air from the standards B, which have lateral openings 10 near the bottom for the cold air, the sections being also secured together by means of setscrews 11 to adjust the height of the drum.

The head 3 is formed with an upwardly-projecting outer flange 12, within which the cylindrical side wall 2 is placed and which is held in position by the securing bolts or rods 13. On the inner edge of the head 3 stands the conical pipe or conduit 14, which has an offset flange 15 at its top to serve as a seat for the cylindrical pipe 16.

Arranged upon the interior of the drum and near the bottom is the conical deflector 17, the lower edge of which is seated Within an outward corrugation or bead 18 of the drum and serves to throttle the space between the drum and pipe 14 to direct the air entering through the slits in the base toward and against the pipe. Similarly intermediate of the deflector 17 and the top of the drum is an inverted conical deflector 19, seated upon a'rib or shoulder 20 upon the pipe 16 and serving to deflect the rising air against the walls of the drum A.

On the top of the drum A is arranged a drum 0 of greater diameter than the drum A, the side walls 21 of. which are preferably sheet metal and held in place by flanges 22 upon the edges of the heads 4 and 5 and the securing rods or bolts 13. The side Wall 21 is provided with peforations 23 around its periphery, serving as air-outlets.

The portion of the head 4 which is immediatelyabove the annular chamber between the drum 2 and pipe 16 is formed with perforations or open-work 24 next the pipe 16, thereby serving to throttle the passage and distribute the lamp-chimney being inserted into the funnelshaped pipe 14, into and through which the products of combustion from the lamp-flame pass, together with the cold air'entering around the lamp-chimney. The standards B are of such size that they will furnish, in connection with the space around the lamp-chimney,sufficient air to prevent overheating of the drums.

I claim-+ 1. In combination with the lamp heatingdrurn, made up of an outer inclosing wall, the inner wall, constituting a conduit to receive the heated gases from the lamp, the air-inlet standards opening into the space between. said outer and inner walls, and the air-distributers separating said inlet-standards from said space.

2. In an apparatus of the class described, the combination with the drum, of the hollow air-conducting standards communicating therewith, the axially-arranged pipe in said drum adapted to be fitted over a lampchimney, and the deflectorsarranged in the space between the drum and pipe.

3. In an apparatus of the class described,

the combination with the cylindrical drum, of the hollow, air-conducting standards supporting and communicating with the same, the conical pipe for the inlet of the heated gases arranged axially in the drum, the deflectors arranged in the space between the drum and pipe, the constricted openings above the funnel and the annular space between the funnel and drum, and the drum of larger diameter arranged above, and in communication with said openings, and provided with lateral outlets.

4. In an apparatus of the class described, the combination with the cylindrical drum, of the annular base formed with double walls constituting an annular chamber or conduit, the upper wall being formed with perforations serving as distributing-outlets for the chamber, the openings in the bottom wall to connect with hollow,supporting, air-conducting standards, the conical axially-arranged pipe Within said drum, the connecting cylindrical pipe serving as a continuation of said conical pipe,

and the deflectors intermediate of said pipes and drum.

5. In an apparatus of the class described, in combination, the cylindrical drum, its chambered annular base having its upper wall perforated, the hollow air-conducting standards opening into the chamber in said base, the axial pipe arranged in said drum adapted to receive and conduct the products of combustion from the lamp-chimney, the deflectors intermediate of said pipe and drum, the head upon said drum having constricted outlets for the air in the space between the pipe and drum, and for the gases passing through said pipe, and the drum'of larger diameter superposed upon said first drum, and having a closed top and lateral vents.

In testimony whereof I affiX my signature in presence of two Witnesses.

CARL H. B. RANDLEFF.

Witnesses:

MINNIE L. THAUWALD, H. S. JOHNSON. 

